CN107327504B - Mounting tool for fulcrum main bearing of central transmission device of aero-engine - Google Patents
Mounting tool for fulcrum main bearing of central transmission device of aero-engine Download PDFInfo
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- CN107327504B CN107327504B CN201710710799.7A CN201710710799A CN107327504B CN 107327504 B CN107327504 B CN 107327504B CN 201710710799 A CN201710710799 A CN 201710710799A CN 107327504 B CN107327504 B CN 107327504B
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- main bearing
- cylindrical step
- cylindrical
- fulcrum
- fulcrum main
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C43/00—Assembling bearings
- F16C43/04—Assembling rolling-contact bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C43/00—Assembling bearings
- F16C43/04—Assembling rolling-contact bearings
- F16C43/06—Placing rolling bodies in cages or bearings
- F16C43/065—Placing rolling bodies in cages or bearings in cages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/10—Force connections, e.g. clamping
- F16C2226/12—Force connections, e.g. clamping by press-fit, e.g. plug-in
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
- Rolling Contact Bearings (AREA)
- Gear Transmission (AREA)
Abstract
The invention discloses a fulcrum main bearing mounting tool of an aircraft engine central transmission device, which comprises a hollow step cylindrical fulcrum main bearing mounting base (1), and a first cylindrical step (11) and a fourth cylindrical step (14) with gradually reduced outer diameters are sequentially arranged along the direction of the central axis of the fulcrum main bearing mounting base (1); screw holes are uniformly distributed on the end surface of the first cylindrical step (11); the outer side of the end face of the fourth cylindrical step (14) is provided with a ball track along the circumferential direction, a notch is formed in the cylindrical surface of the fourth cylindrical step (14), and a detachable stop block (22) is arranged in the notch. The invention can not only quickly, accurately, efficiently and stably fix the bearing retainer and the balls on the outer ring of the fulcrum main bearing, realize the purpose of assembling the upper and lower semi-inner rings and the driving bevel gear component to improve the working efficiency, but also improve the assembling quality, greatly reduce the labor intensity of workers and well meet the use requirements.
Description
Technical Field
The invention relates to a mounting tool for a fulcrum main bearing of a central transmission device of an aircraft engine, and belongs to the technical field of machine manufacturing.
Background
In the process of assembling the fulcrum main bearing of the central transmission device of the aeroengine, parts such as a fulcrum main bearing outer ring, a bearing retainer, balls, an upper half inner ring, a lower half inner ring, a driving bevel gear, an adjusting pad and the like need to be assembled (as shown in figure 1). When the main bearing of the fulcrum is installed, firstly, the installation thickness of the adjusting pad is determined; secondly, mounting the adjusting pad and the upper half inner ring on the driving bevel gear (hot-press mounting); placing the upper half inner ring ball track of the installed driving bevel gear assembly upwards again; then sequentially installing the outer ring of the fulcrum main bearing, the bearing retainer and the ball; and finally, assembling the lower half inner ring (hot-press mounting) to finish the assembling work of the main bearing of the fulcrum of the central transmission device. Because no special tool is arranged when the fulcrum main bearing outer ring, the bearing retainer and the balls are installed, the assembly can be completed only by coordinating and unifying the actions of three persons, one person holds the fulcrum main bearing outer ring to ensure that the fulcrum main bearing outer ring ball track is concentric with the upper half inner ring ball track of the drive bevel gear assembly, one person holds the bearing retainer to ensure the relative position of the bearing retainer and the fulcrum main bearing outer ring, the other person puts the balls into the bearing retainer (twenty balls) one by one, and the balls roll out from the tracks by slight error when the three persons cooperate. It can cause the ball to scratch or slide off the ground creating quality problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides an aeroengine central transmission fulcrum main bearing mounting tool, quick, accurate, high-efficient, stable is bearing holder, ball fixed mounting on fulcrum main bearing outer loop, realizes that half inner ring and initiative bevel gear subassembly improve work efficiency purpose about the assembly.
The technical scheme of the invention is as follows:
a mounting tool for a fulcrum main bearing of a central transmission device of an aircraft engine comprises a hollow step cylindrical fulcrum main bearing mounting base, and a first cylindrical step, a third cylindrical step and a fourth cylindrical step with gradually decreased outer diameters are sequentially arranged along the direction of the central axis of the fulcrum main bearing mounting base;
screw holes are uniformly distributed on the end surface of the first cylindrical step;
the outer diameter of the third cylindrical step is larger than the inner hole diameter of the lower half inner ring of the fulcrum main bearing;
the terminal surface outside of fourth cylinder step is provided with the ball track along the circumferencial direction, and it has the breach to open on the face of cylinder of fourth cylinder step, is the detachable dog in the breach.
Further, a second cylindrical step is arranged between the first cylindrical step and the third cylindrical step;
further, the tolerance fit between the outer diameter of the second cylindrical step and the hole diameter of the inner hole of the outer ring of the main bearing of the pivot of the central transmission device is H11/H11, and the tolerance fit is used as a positioning reference.
The notch is provided with grooves on two sides, the stop block is arc-shaped, and two ends of the stop block are respectively provided with a boss.
Compared with the prior art, the main bearing can be quickly assembled by the mounting tool for the main bearing of the pivot of the central transmission device. Firstly, assembling a driving bevel gear assembly; secondly, mounting a fulcrum main bearing mounting tool base on the outer ring of the fulcrum main bearing and fixing the fulcrum main bearing mounting tool base by using screws; mounting the bearing retainer again, then mounting the balls one by one, and inserting the stop blocks; then assembling the driving bevel gear assembly from top to bottom above the installed parts, inverting the whole assembly part after assembling, and removing the fulcrum main bearing installation tool; and finally, mounting the lower half inner ring (hot-press mounting) to finish assembly. Therefore, the bearing retainer and the balls can be quickly, accurately, efficiently and stably fixedly arranged on the outer ring of the fulcrum main bearing to assemble the upper half inner ring and the lower half inner ring and the driving bevel gear assembly, the purposes of improving the working efficiency and the assembling quality are achieved, the labor intensity of workers is greatly reduced, and the use requirement is well met.
The invention can not only quickly, accurately, efficiently and stably fix the bearing retainer and the balls on the outer ring of the fulcrum main bearing, realize the purpose of assembling the upper and lower semi-inner rings and the driving bevel gear component to improve the working efficiency, but also improve the assembling quality, greatly reduce the labor intensity of workers and well meet the use requirements.
Drawings
FIGS. 1 and 2 are schematic views of the assembled state of the center drive fulcrum main bearing;
FIGS. 3 and 4 are schematic views of the operating condition of the central transmission fulcrum main bearing installation tool;
FIGS. 5 and 6 are general views of a central transmission fulcrum main bearing installation tool;
FIGS. 7 and 8 are views of a central transmission fulcrum main bearing installation tool base;
FIG. 9 is a block diagram of a central transmission fulcrum main bearing installation tool;
in the figure, 1, a fulcrum main bearing mounting base 11, a first cylindrical step 12, a second cylindrical step 13, a third cylindrical step 14, a fourth cylindrical step 21, a central transmission fulcrum main bearing outer ring 22, a fulcrum main bearing lower half inner ring 23, a fulcrum main bearing retainer 24, balls 25, a fulcrum main bearing upper half inner ring 26, an adjusting pad 27 and a drive bevel gear.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but the scope of the claimed invention is not limited thereto.
The design of the mounting tool for the main bearing of the fulcrum of the central transmission device of the aero-engine comprises the following steps:
firstly, analyzing the working principle.
The fulcrum main bearing installation process can be seen in fig. 1 and 2. Firstly, determining the installation thickness dimension of the adjusting pad 26; secondly, mounting an adjusting pad 26 and an upper half inner ring 25 of the fulcrum main bearing on a driving bevel gear 27 through heating and press mounting; the ball tracks of the upper half inner ring 25 of the fulcrum main bearing of the installed driving bevel gear assembly are enabled to face upwards again; then three persons cooperate with one person to hold the fulcrum main bearing outer ring 21 of the central transmission device in a hand mode to ensure that the fulcrum main bearing outer ring ball tracks are concentric with the ball tracks of the upper half inner ring 25 of the fulcrum main bearing of the driving bevel gear assembly, one person holds the fulcrum main bearing retainer 23 to ensure that the fulcrum bearing retainer 23 and the central transmission device fulcrum main bearing outer ring 21 are in relative positions, and the other person puts the balls 24 into the fulcrum bearing retainer 23 one by one; and finally, mounting the lower half inner ring 22 of the fulcrum main bearing by hot pressing to finish assembly.
As can be seen from the above analysis of the original assembly process, the rolling of the balls 24 out of the track occurs due to slight errors in the cooperative work of the three persons, which may cause the balls 24 to scratch or the balls 24 to fall off the ground, thereby causing quality problems. Therefore, the assembly of the fulcrum main bearing is difficult, and the assembly quality of the fulcrum main bearing of the central transmission device is also seriously influenced. In order to solve the assembly problem of the central transmission device fulcrum main bearing, a set of special tool for the central transmission device fulcrum main bearing is designed according to the assembly characteristics and the principle (as shown in figures 5 and 6). The support point main bearing retainer 23 and the ball 24 are fixedly arranged on the outer ring 21 of the support point main bearing of the central transmission device, and the assembly of parts such as the driving bevel gear assembly, the lower half inner ring 22 of the support point main bearing and the like is easily completed.
The fulcrum main shaft assembling working steps by using the fulcrum main bearing special tool are as follows: the first step is to determine the installation thickness dimension of the adjusting pad 26; secondly, mounting the adjusting pad 26 and the upper half inner ring 25 of the fulcrum main bearing on a driving bevel gear 27 (called a driving bevel gear component below) in a hot-press mounting mode; thirdly, mounting the fulcrum main bearing mounting tool base 1 on the central transmission device fulcrum main bearing outer ring 21 and fixing the fulcrum main bearing outer ring with a screw 3; fourthly, mounting a fulcrum main bearing retainer 23; a fifth step of installing balls 24 in the fulcrum main bearing retainer 23; sixthly, inserting the stop block 2 (figure 9) to prevent the ball 24 from rolling out of the track; seventhly, assembling the driving bevel gear assembly from the upper part of the installed component to the lower part; the eighth step inverts the entire assembled assembly (face down drive bevel gear 27); ninth, dismantling a fulcrum main bearing installation tool; and finally, mounting the lower half inner ring 22 of the fulcrum main bearing (hot-press mounting) to finish assembly.
Second, the structural design
Through the analysis of the working principle, a set of mounting tools for the fulcrum main bearing of the central transmission device of the aircraft engine is designed, and as shown in fig. 3 and 4, the mounting tools comprise a central transmission device fulcrum main bearing mounting base 1, a stop block 2 and a screw 3.
the fulcrum main bearing mounting base 1 is a hollow stepped cylindrical body, as shown in fig. 5 and 6, wherein a fourth cylindrical step 14 at the right end is provided with a ball track formed along a diameter Φ D5mm with an arc radius Φ Dd/2. In the figure, the Lo +/-0.03 mm size enables the ball tracks of the fulcrum main bearing mounting base 1 to be superposed with the ball tracks of the central transmission fulcrum main bearing outer ring 21. The right end step (third cylindrical step 13) of L1 ± 0.1mm size is for supporting the fulcrum main bearing cage 23.
The positioning mode of the mounting tool for the fulcrum main bearing of the central transmission device is that positioning pins are positioned and clamped, namely the cylindrical surface (the cylinder is used as the positioning pin) of the second cylindrical step 12 of the phi D2XL3mm and the end surface of the first cylindrical step 11 are positioned with one hole on one surface of the outer ring 21 hole phi D2' mm (positioning hole) and the bottom surface of the fulcrum main bearing of the central transmission device, the maximum fit clearance is 0.1mm, and the minimum fit clearance is 0.05mm, so that the positioning is rapid and convenient. The bottom end is a kidney-shaped counter bore which is uniformly distributed at phi 6.5/R7.5mm and 7mm deep of phi Do mm, and the fixing of the fulcrum main bearing mounting base 1 and the central transmission device fulcrum main bearing outer ring 21 by the screw 3 is realized.
The minimum inner hole of the fulcrum main bearing mounting base 1 is phi D3mm, a gap is formed between the inner hole phi Dhmm of the inner ring assembly position size of the driving bevel gear assembly, and the maximum gap of 1.7mm and the minimum gap of 1.6mm are guaranteed with the inner hole of the fulcrum main bearing mounting base when the driving bevel gear is assembled, so that the requirement of free assembly of the driving bevel gear 27 is met. An m1Xh2mm (bottom of the groove is inverted R11.5mm circular arc) notch is formed at the upper track position (the right end in the view of figure 6) for installing the ball (the diameter phi Ddmm of the ball 24). Meanwhile, a groove with the depth of h2 and m1Xh1X is designed in the axial direction and used for installing bosses at two ends of the stop block 2, and the stop block 2 is used for preventing the ball 24 from rolling out of the track after being assembled. In order to prevent the ball 24 from scratching during assembly, the material is selected from brass soft material with the hardness of HRC 18-23.
The stop block 2:
the block 2 is shown in fig. 9, and the structure is that the diameter of the inner hole is 2R1, the diameter of the outer circle is 2R2, and a cylinder matched with the height of the notch is cut into a shape which is symmetrical to the center line and has the width of L1. And milling h2 bosses at two ends to be matched with the fulcrum main bearing mounting base 1, using a stop block to prevent the balls 24 from rolling out of the track when the balls are assembled, and selecting a brass soft material for preventing the balls from scratching the material, wherein the hardness of the brass soft material is HRC 18-23.
And (3) screws:
the bolt 3 is a cylindrical head internal hexagonal bolt with the model number of GB70-76 (M6X 10), the bolt 3 is used for positioning the fulcrum main bearing mounting base 1 and the fulcrum main bearing outer ring 21 of the central transmission device, and the material is 1Cr18Ni9 Ti.
Claims (1)
1. The utility model provides an aeroengine central authorities transmission fulcrum main bearing mounting tool which characterized in that: the supporting point main bearing installation base comprises a supporting point main bearing installation base (1) in a hollow step cylindrical shape, and a first cylindrical step (11), a third cylindrical step (13) and a fourth cylindrical step (14) with gradually decreased outer diameters are sequentially arranged along the direction of the central axis of the supporting point main bearing installation base (1);
screw holes are uniformly distributed on the end surface of the first cylindrical step (11);
the outer diameter of the third cylindrical step (13) is larger than the bore diameter of an inner bore of the lower half inner ring (23) of the fulcrum main bearing;
a ball track is arranged on the outer side of the end face of the fourth cylindrical step (14) along the circumferential direction, a gap is formed in the cylindrical surface of the fourth cylindrical step (14), and a detachable stop block (22) is arranged in the gap;
a second cylindrical step (12) is arranged between the first cylindrical step (11) and the third cylindrical step (13);
the tolerance fit between the outer diameter of the second cylindrical step (12) and the inner hole aperture of the outer ring (21) of the main bearing of the fulcrum of the central transmission device is H11/H11;
the two sides of the notch are provided with grooves, the stop block (22) is arc-shaped, and two ends of the stop block are respectively provided with a lug boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710710799.7A CN107327504B (en) | 2017-08-18 | 2017-08-18 | Mounting tool for fulcrum main bearing of central transmission device of aero-engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710710799.7A CN107327504B (en) | 2017-08-18 | 2017-08-18 | Mounting tool for fulcrum main bearing of central transmission device of aero-engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107327504A CN107327504A (en) | 2017-11-07 |
| CN107327504B true CN107327504B (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710710799.7A Active CN107327504B (en) | 2017-08-18 | 2017-08-18 | Mounting tool for fulcrum main bearing of central transmission device of aero-engine |
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| CN112963446B (en) * | 2021-01-26 | 2022-12-06 | 中国航发贵州黎阳航空动力有限公司 | Assembling and disassembling method for lubricating oil pump with eccentric boss |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6805109A (en) * | 1968-04-10 | 1969-10-14 | ||
| SU1760206A1 (en) * | 1990-09-28 | 1992-09-07 | Загорский Филиал Всесоюзного Научно-Исследовательского Конструкторско-Технологического Института Подшипниковой Промышленности | Method of assembling radial-thrust ball bearings with lock on one race |
| JP2009156456A (en) * | 2007-12-28 | 2009-07-16 | Jtekt Corp | Assembling method of rolling bearing |
| CN102011801B (en) * | 2010-11-23 | 2012-07-04 | 上海天虹微型轴承研究所 | Method for manufacturing integral antimagnetic bearing with preload |
| CN202520801U (en) * | 2012-03-23 | 2012-11-07 | 韶关东南轴承有限公司 | Die for assembling double row angular contact bearings |
| CN202719112U (en) * | 2012-07-05 | 2013-02-06 | 中航商用航空发动机有限责任公司 | Locking assembly for drive gear box and drive gear box |
| FR3032017B1 (en) * | 2015-01-26 | 2017-08-18 | Ntn-Snr Roulements | ALLEGE BEARING MODULE AND METHOD FOR ASSEMBLING SUCH A MODULE |
| CN106640989B (en) * | 2015-08-04 | 2018-05-22 | 襄阳振本传动设备有限公司 | Biserial thin-wall angular contact ball bearing assembles device |
| CN106363408B (en) * | 2016-11-25 | 2019-12-13 | 中国航发沈阳黎明航空发动机有限责任公司 | assembly process method of aeroengine bearing |
| CN106838010B (en) * | 2017-02-08 | 2019-06-28 | 中国航发沈阳发动机研究所 | A kind of the base bearing holding meanss component and aero-engine of aero-engine |
| CN207178489U (en) * | 2017-08-18 | 2018-04-03 | 中国航发贵州黎阳航空动力有限公司 | A kind of aero-engine central transmission device fulcrum base bearing installation tool |
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